Apparatus for the manufacture of finned structures



J ly 10,1945. Lju. LARKW 2,379,973

APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES Original Filed March 19, 1938 ll Sheets-Sheet 1 a INYENTOR, a/Lf 1 ATTORNEY.

L. u. LARKIN July 10, 1945.

APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES Original Filed March 19. 1938 ll Sheets-Sheet '2 IzVEN'fO 5 ATTORNEY.

L. u. LARKIN 2,379,973 APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES July 10, 1945.

Original Filed March 19, 1938 11 Sheets-Sheet 5 @N Y N w v u lw K NQ b a v 11 Sheets-Sheet 4 L. u. LARKIN Original Filed March 19, 1938 APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES 2 I VE TOR,

6; ATTORNEY.

| u. LARKIN July 10, 1945.

APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES 'Original Filed March 19, 1938 ll Sheets-Sheet 5 ENTOR, WM

' ATTORNEY.

| u. LARKIN 2,379,973

Original Filed March 19, 1938 ll Sheets-Sheet 6 July 10, 1945.

APPARATUS FOR THE MANUFACTURE OF FINNEDSTRUCTURES /4,; ATTORNEY.

s9 BY L. U. LARKIN July 10,1945.

APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES Original Filed March 19, 1938 ll Sheets-Sheet 7 922 a TNYhZNTORI A TTORNEY,

y 1945- L. u. LARKIN 2 ,379,973

APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES Original Filed March 19, 1938 ll Sheets-Sheet 8 w M 484 (844) 5 //0 m2 w A I 038 4% f 498 2'09 :r-/% m NVENTO)R, /fd/Z/ ATTORNEY.

y 9 L. U. LARKIN 2,379,973

APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES ll Sheets-Sheet 9 Original Filed March 19, 1938 Q0000 0 11 oooo 0 0 o 0 0 o "0 X ZINYENTOR 4 ATTORNEY.

i/" 1945- L. u. LARKIN 2,379,973

APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES Original Filed Ma roh 19, 1938 ll Sheets-Sheet 10 I I I I l l l g- 38 650 y 4% w 32 a? /26 iii 6% ATTORNEY.

July 10, 1945.

L. u. LARKIN 2,379,973

APPARATUS FOR THE MANUFACTURE OF FINNED STRUCTURES Original Filed March 19, 1938 ll Sheets- Sheet 11 ATTORNEY.

5 Z61 BY Patented July 10, 1945 Lester U. Larkin, Chicago, 111., assignorto Lul Products, Inc., Baltimore, Md., a corporation of Maryland Original application March19,,11938, Seriall lor 196,881. Divided and thisapplication July26, 1941, Serial No. 404,105

Claims. (01. -865)" This application is a division of my copending. improved means for removing thestube and iins application Serial No. 196,881, filed on March 19, 1938, Patent No. 2,258,618, issued October 14, 1941. My invention relates to the art of automatic machines. More specifically, my invention relates to an improved apparatus for the manufacture of an improved finned heat exchange coil, particularly adapted for use' as an evaporator in a mechanical refrigerating system.

1 Among the objects of my, invention is to provide automatic machinery for 7 manufacturing finned coils and like structures, which is relafrom the retaining means.

A further object of myinvention is to provide an improved tube expandenan improved mechanism for moving the expander into and outof the tubes, including automatic meansfor stoptively easy to operate and does not require skilled labor, maybe operated by a single operator with minimum attention, may. bereadily assembled or disassembled for shipment, may-be installedin a small space, has relatively small floor load, does not require special or expensive foundations, requiresbut a small amount of power for'operation, and is capable of rapidly manufacturing finned coils of any desired dimensionsof coil len th, fin size and fin spacing, in a roomhaving normal ceilingheight.

Commercial refrigerators are constructed in a multitude of sizes and shapes and are used for many different purposes requiring different temperature levels, and as a result it has become the established practice, in the industry for the cabinets andthe evaporator coils to be made by different manufacturers. Consequently after the various factors afiectingthe size of the evaporator have been determined for each individual installation, the proper coil is ordered from a coil manufacturer, whomaintains a factory for making coils. This not only entails delays incident to shipping, but involves additional expense, asa completed coil is bulky and must be care, fully created in order to avoid damage.

, However, due to its low'cost and simplicity of operation, an automatic machine in accordance with my invention may be supplied to a dealer or jobber, whereby he may construct coils of variousxshapes and sizes as they are required for each installation. In thisway, not only is there considerable saving in time, but freight costs are materially reducedas the parts necessary for the construction of a coil ma be shipped much cheaper than a completed coil.

Furthercbjects of my invention are to provide, in a machineo-f the type above referred to,improved means for holding a tube in position ex tending through apertures in fins which are re tained in spaced relationship, improved means for expanding the tube within the apertures, and

ping the movement of the expander in both directionsqot travel, and improved supporting means for intermediate points of the'ro-ds which. carry theexpanders. I i

,Further objects and. advantages of, my inven-,

tionwill be apparent from the following de-* scription considered in connection with the ac companyingdrawings vvhich form, a part of this specification. In, the description, the various elements have in: generalbeen given more or less specific terms in order that the description may be more readily understood, but it is not intend ed that any specific terminology shall limit the scope of the disclosure and the specific: terms are intended to include all equivalent elements.

-As will appear more indetail hereinafterthe machine in accordancewith myinvention may be ,3 31, to include ,four principal parts, namely, a

main frame, a run-out frame, afin depositing carriage and tubewexpander mechanism. The frames are preferably madeof structural steel, the run-out framebeing a continuation of the main frame. The fin depositing carriage is arranged to travel on the main frame, while the expander mechanism moves along both frames. The particular fin depositing mechanism herein illustratedand briefly describedforms no part of the invention claimedherein beingclaimed in my copending application'serial No. 196,881, and could be replaced by other apparatusperforming similariunctions.

Suitably-supported along the main frame are time from the magazine to the comb trough."

Automatic mechanism is provided for alternately connecting the motor with the fin transferring mechanism and with the pinion fordriving the carriage, whereby a fin is transferredto the comb the main frame.

series of fins being deposited in spaced relation ship in the comb trough.

The fins are formed with one or more apertures through which tubing is inserted after the fins have been transferred to the comb trough.

lines l9-I9 of Figs. 1 and 20, but .includes certain structure not shown in Fig. 1;

Fig. 20 is a cross-sectional view taken on the,

and while the fins are still retained in parallel position therein. Clamping means is provided on the main frame for retaining such'tubin'g against lengthwise displacement with respect to thefins.

'The. tube expander mechanism includes a puller head which is mounted to run on a track which extends substantially the entire length of both the main and run-out frames, to which head is attached one or more expander rods.

The puller head is caused to travel along itstraek by any suitable means, such as by a pinion rotating about a fixed axis and engaging a rack carried by the puller head. The pinion maybe driven in either direction, as by a reversible electric, motor, or through the medium of a reversing gear.

The expander rods connected to the puller carry tube expanders which areint'roduced into the tubes held in position within the apertures of the fins by causing the puller head to travel in a direction from the run-out frame toward The tube expanders are so constructed that they do not expand the tubes while being introduced thereinto. Upon a reversal; of the direction of travel of the puller head so as to' withdraw the expander from the tubes, the expanders are constructed to expand the tubes within the apertures of the fins, thus causing the fins to tightly grip the outer surfaces of the tubes. 3

Automatic means are provided for controlling thetravel of the puller head in both directions so, as to stop the travel of the puller head when the expanders have been fully introduced into the tubes and to stop the travel of the puller head in the opposite direction after the expanders have been withdrawn from the tubes. Mounted to run on a track carried by the runout frame are trolleys for supporting intermediate points of the expander rods for the purpose of preventing undue sagging of these rods when they are withdrawn from the tubes.

The mainframe also supports a lifting bar for removing the fins and tubes after the latter have been expanded so as to form with the fins an integral unit. V

The above, and otherrelated apparatus, is described hereinafter in detail, and is illustrated in the accompanyingdrawings, of which:

Figs. 1 through '7 constitute atop view of the frame of the main machine for manufacturing finned coils;

Figs. 8 through 14 are cross-sectional views taken on the corresponding section lines of Figs. 1 through 7, respectively, "and each figure is taken on the line (8-I4)-(8-I4) of Fig. 18; Fig. 15"is a cross-sectional view taken on the lines I--I5 of Fig. 8 and Fig. 16;

Fig. 16 is a cross-sectional view taken on the line I6--I6 of Fig. 15; I

Fig. 17 is a side view of the fin depositing carriage mounted on the frame;

"Fig. 18 is a rear end view of the carriage, the frame being shown in section along the line Iii-I8 of Fig. 1'7;

Fig. 19 isa cross-sectional "view taken on the Fig. 22 is a cross-sectional view taken on the line 22-22 of Fig. 21; i Fig. 23 is a cross-sectional view taken on the lines 23-23 of Figs. 11 and 21;

' Fig. 24 is a cross-sectional view showing a detail of the carriage illustrated in Figs. 17 and 18;

' Fig. 25 is a cross-sectional view taken on the line 2525 of Fig. 14;

Fig. 26 is a cross-sectional view taken on the lines 26-26 of Figs. 7 and 25;

Fig. 27 is a cross-sectional view taken on the line 21-21 of Fig. 13;

Fig. 28 is a cross-sectional view taken on the line 28-28 of Fig. 11; I I I Fig. 29 is a top view of the device shown in" F1 .28;'

Fig. 30 is a cross-sectional view of an expander;

Fig. 31 is a cross-sectional view taken on the line 3I-3I of Fig. 30;

Fig. 32 is a cross-sectionalviewtaken on the line 3232 of Fig. 30; and Fig. 33 is an end view of a ring formi part of the expander head.

The main frame ably made of structural steel and includes apair of parallel angles I00 which are suitably secured toa floor or other foundation. Secured to angles I00at suitable intervals are vertically extending channels I02. Corresponding channels I02 onopposite sides of the frame are connected by cross-angles I04 a short distance above the floor, and similar cross-angles I06 near their upper ends. Extending longitudinally of the frame and secured to the inner sides 01 channels I02 are angles I08 and H0. Mounted on the horizontal leg of angle I08 is a member H2 having a rack I I4 extending along one side of its upper surface and a, track II6 extending parallel to the rack. Angle IIO carries a track II 8.

Secured to the horizontal flanges of angles I06 in any suitable manner, as by welding, are pairs of blocks I20 and I22 (see particularly Figs..18 and 22), the inner ends of which are spaced apart to leave a space I24. Supported on blocks I 20 and I22 are longitudinally extending plates I26 and I28. These plates have secured thereto, as by welding, longitudinally extending angles I30 and I32. .The plates are adjustable in a transverse direction so as to permit variation in the are provided with transverse slots I34 through which extend bolts I36 which are anchored in the angles I06 and the blocks I20 or I221 Bolts That is, by abutting Figs.

see ers tit with wins? nuts I" which be tightened against the horinmtalfionges of angles m and I32: to retain these engine in desired positionsi plates and. angles carried: thereby are ofi'iequsl length, which. summit-' I 3 raised I n it is am to remove: the so trons, cent It! is. rotated to ash loosen them.

whexeunm the clamping device-I may be mate-l3; distance hetweenII adialcent channels with a, recess E441 adapted to receive pins MAE "which protrudeII outwardly from the, vertical flanges; or angles till and In; The inner tacos;

or combs M0 are formed with equally spaced; grooves I48, Due tothe inclination of the flanges at angles WI and I32; opposite comb sectionssre iurther apart at the toothed at the bottom Spldng of these grooves is some as the closest spacing desired of the flnson the coil whichiisg I to be'manufactured by the machine; If desired a: plurality of sets of comb sections having dificr 1 ent groovespac-ings:maybeprovided.

An angle III is secured transversely hetweenf pair of channels lllz, counting left toward therightlin Figs. 1 and 8; Bolted to the horizontal flange of angle I101 is a mem m' tFigs. re, 20) including a fixed clamping plate or wall "2, which is; formed with on inturncd lip on abutment "4. Member III also includes a slotted plate or wall I16 from the side of which extend arm's If" between which is journallcd c ca m I18 which projects through the slot; I (Figs, 1, 20) in plate I116. The carols formed handle "6 for rotating it; Plate ITiis: formed withaniabutment I19. Bearing plates IRI are securedto the ends of, plates m and I16. purpose of this clamping device will be explained later in the'description machine.

The comb'sectlons Imam clamped in place b means of clamping devices shown in Figs. 411 1 21* and 23. There is one clamping devicelor the comh sections supported by angles I and 'a slml lar clamping device for the comb section sup;- ported by angles I32. Each clamping device in cludes 'a forked member I52 having parallel spaced legs I54 and I56, which are adapted to strfaddle the vertical flanges of angles I and I32. The outer leg I54 is provldedwlth a vertisally extending slot I58 which slides over'oneot the pins I46 carried by the flanges. The inner leg I66 carries a. pin I60 on which is rotatably niounted a. cam I 62, which may be rotated by means of a, handle I 64. Secured to the upperend of member I52 is an arm I68, the opposite and ofwhich is formed with a slot I66 adapted to en- 'gage another of the pins I46. When the clamping devic is in the posltionshown particularly in Fig. 21, the cam I62 contacts the end of the last :comh section I40 and, if the handle mus raised,

the cam tends to-displace the comb section to thc left. The ends of the several comb scctionsare in contact with each other, and the end'olf the last comb section at the other end 0! the frame is, in contact with the bearing plates I8I.- Gonlsequentlyhwhen thecam I62 is rotated in the above manner, it serves to clamp all of thecomb ,scctions together. The brackets I42 011 the comb sections hold them in a, vertical position and the pins I46, which engage within the recess (in I 'thebrackets I42, prevent the comb sections from by mung iron the pins m. Thercumn.I the in;

dmdusl comb sections, startms at the risht, 'as

uiewcd in the figures; may beslid m sumcieut dis:

tance tothe right so that: the pins t4! are no longer disposed wltlun the recess 144- in the brackets In, whereupon each comh section may be lifted am If it is not desired to. Q1? the entire length or the machine; only a, portion of thctotal number or comb sections need he and the clamplng dovice for the comh'soctiond: maybe placed anywhere alons theIflanses m and I32, that is, withlthe slots I48 and IR-or the: clamping device. in en agement with any" adiacentpalrorplnskfl. 1

scoured to onposlte channels? I4! at melons tlon betweencross angles I04. and I06 em oddi tlonal cross: angles to: to which arc'holtodhcarings I64 for a lon itudinally extending shalt I; 6 $86 is made in twosectlons which may be joined, together by means or a. coupling I show I ln-Flg 10. The coupling comprises a sleeve which ispermsncntly sccured to one. Section of the shalt y means of s fixed pin "land may be. secured to the other scotionby means of a removable nin I61. A chain I91 is preferably provided for pro I venting lossolthe pin I82 when it ls removed the coupling so as to disconnect the two of the operation of this from Portions. f the shaft.

Extending vertically from thocross sngIesIII-Q Imadning pairs of vertical angles H6 are secured I tocross angles 10.6 as is shown tor instance. in Fig. 10 Vertical angles! 0alry ortlca1Iyjex tendingguide channels I66 betwecnwhich is slidablyI disposed a block 200 having a. cam. canteen the projection 242 extending trom cneside of it (to theright as shown in. E13,. 16) and hcycndthc guide channels I 98. Secured toshaltt I86 is a cam 204 which iscontactcd by projection 202 so that,

when, the cam is rotated in a clockwise direction, as shown ln Fig. 18, the block will be raised. Secured to block 200 isaI rod 206 which extends upwardly therefrom andiss cured to a longitudiholly extending bar 208. which normally extends through the spaces I34 between the pairsof blocks I20 andlu. It'will lmtnuotcd that there is a cam 2(I4securedto shaft I86 adjacent to each oi! the vertical channels IM or themaiuframe. and that thehar 268 extends the entire length 01' the main Iramd However, the bar 208 is made in two sec tions (see Fig. 10), as is the shaft I86. Consequently if the second section of. the shaft is un' coupled. from the first, only the first section or the bar 208 will he raisedupon rotation of the I shalt. Ahendle 2U keyedto the left hand end .to the first section of short I84 is provided for rotating the shaft I II Thcfin depositing carriage I. 'Ihefindchositing carriage is shown lungs.

17, 1a and. 24, but it will be described but brifly.

inasmuch as it is not claimed herein, and-refer- I once may be had to my etorcsaidl'PetentiNo. 2,258,618 for a complete description of its construction and mode ofoperetion. I I

Briefly, it consists of chase plate 2I2 which is mounted on flanged wheels 2I6 adapted to run on track H 8, and with rollers 226 .which ere adapted to- 'run' ontr'a'ck'r-I I6 :7 The plate 212' can lies a fin m'agazine" including tangle members 344 movably secured to the:p1ate by means ofthumb' screws348whichengage slots 346.1" Smooth rods 350 and 352 are 'embeddedin the plate 2I2 and the inner surfaces of"the:ang-les1 344=in order to support the fins'irr'the magazine with a minimum offriction-n The properspac'ing of theangles-344 for a given size of fin may be obtained bymeans' of the too1f664 (FigLZl) Thisincludes aw handle 666 on whiehris mounted a gauge 668 to determine the spacing; "A pin"6'I0 extending from the bottom face of :the gauge is adapted to enter a recess 612 in plate 2I2 in order to assure correct: centeringoftheangles344..J I 'An electric motor: 226: is mounted on a ,frame work carried by plate 2I2 and through suitable, gearing may be intermittentlyconnected to afin depositing "chain 246', the Ifunction of: which; i to remove one fin at 'a? time from the magazine and deposit it in a pairof grooves I48 of the combs I40; 'After each finis deposited," the motor is automatically disconnected from chain 246 and connected to drive a.'gear-388 which meshes with therack 114 onthe 'main frame. Rotation of this gear serves to advance thegcarriage along the tracks? H6 and 1II8' apredetermined distance, whereuponithe motor is automatically disconnected from-the gear388 and-again connected'to chain 246-todeposit-another finin spaced relationship to the previously deposited fin. Asa result of the operation of thiscarriage, a series of fins 684are deposited in the grooves I48,with the apertures v686 in .the'fins in alignment.

' The rd n-eutfmme I Connecte'dto and forming an extension of the main: frame is ,a run-out.frame, which is shownin therigh't handportmnsfof Figs. l and ligand inFigsifi, 6, 7 12 13 andll. Angles I00of the mainframe are'continuedthroughout the length ortherun -out frame, .as areangles IOB. Vertically extending channels 434 connect angles I00 and I03, and these channels extend above angles I08; where the channelson opposite sides of the run-out frame are connected by transverse channels 486. Transverse angles I04 connect the lower portions 'of .the channels 484. Secured to angles I04, a s'by weldinggare spaced parallel channels 488 (Figs. 25 and 28) which serveas tracks on'whichrun a puller head, designated generally loy reference character 490.

tor' base? Theextended'endof angle W4!) is like-- wise supportewbymeansof ach'annel508r;

"Mounted on the base'formed by" angles 104a and' H141) is an; electric motor 5I0xa'ndza gear. reduction box 5I2. 'A powerishaft 5I4: extends from"the side of'gear box 5I2 in axial alignment with" shaft 500. Shaft 5I4 carriesonevmember 5I6 of a do'g clutch." The. other member 5I8 of the'clutch is keyed to shaft 500, but is axially slidable" thereon; Mounted in-an annular groove formed in the shank 520 of clutchmber 5I8,- is a-clutch collar 522 with respect: o which the shank 520 is rotatable. 'Collar .522 "carries pins 524'which engage in slots formed in a clutch throw arm 526. The lowerend of @arm 526 is pivoted at 523 to'the motor'basawhile the upper end is pivotally'connected to one end ofan arm 530 of a toggle mechanism." Theoppositeend of'arm 53-0*is pivotally'connected"at'532 to the othe'r 'arm 534*of the toggle' 'which oth'ervarm is pivoted'at536 to a member 531. -Member 53.1:is pivoted on a horizontal pm 539 to a fixed member on'the frame.- 'A bar 538 isisecured to the pivot pin 532 of'the toggle. A tension spring 540 is connected between one end-of bar 538' and; a bracket 542 fixedto the 'frame-wAca-ble 544 has one end connected to bar 538 and extends-the entire length of the" main frame, "and ha its :other end anchored. to the transverse angle: 106 a(Fig'. 8) at the'far .endof themainiframe; 'Arms 530 and 534 of the toggle are provided with .pins 546 (Fig. 29) which contact the bar 538 to limitmovement of the toggle arms in one direction,"and which engage in recesses 548 formed-in the ends of the arms to'limit their movement in the'OpPosite'diiec'tion; I l A forked retainingguide 53I extends fromjthe frame on either side of arm 526'; Rollers 533 are operating shaft-5M which carries a" switcharm 552to Which is connected a rod -554 which ex v tends the entire length of the main frame and" is.

,The pulle head includes a channel 492 ofla length substantially equal to that of "the" min out frame. 'I'he flanges of the channel support flanged rollers 494 which 'run' on the"tra'cks formed by channels 486. Secured toth'e back of the Web of channel 492 is a rack 496, Whichex tends the entire length of the channel. This rack is engaged by a pinion 493 secu'red to'a shaft 500 mo'untedjin stationary bearings 502 which are supported on the upper horizontal fianges' of short channel pieces'504." Channels 504 aresupported on the transverse angle I040L' which-ex tends transversely -between the :two vertical channels I02 which are located at the juncture of the mainframe'and therun-out frame. Angles 104a differ fromthe other angles I04 by being extended beyond the side of theframe to forma portion offamotor. base; The extended end of angle "3411 is supported by means of a channel 506 extending to the floor; A similar angle I041) is securedto channels 488 at some distance from angle 104a and formsanother portionof-the mo;

slidably supported" in eye bo1ts556. Whenthe switch arm 552 is in a central position, the mo: tor circuit is open. 'When the arm is pivoted to one side of this positionthe motor rotatesinone direction, while if the arm is pivoted to theother side the motor rotates in the opposite direction; Theteeth on the dog clutch members 516 and 5llfljare formedwith inclined faces on one side and straight faces on the-other-side. Consequently, when the direction of 'rotation' is such that the inclined" faces of the teeth are transmitting-thetorque; there is a tendency for. the teeth to ber'forcedout-.of mesh, whereas when the straight sides of the teeth' are transmitting" torque," there i's no such tendency. 'A' tension spring 564 isnonnectedbetween the upper' end -of clutchthro'w a'rm526 and the frame and tends to disengagethe clutch at an times.

The right hand end or" the I 'uur" h" ad viewed .in Figs} and 1l,--includes a vertically extendin flchannel 566 which is braced inclined, channel 568; Welded to the fiangesat the upper endof channel 566 is a plate 510 which carries angle brackets 512 on which are rotat;

ably. mounted 4 flanged rollers 514, 'I hese rollers emttransverse @1811876 l .91. ml ewfilil.

en age unde neath the ho zonta flanges t rmed an aggles I98 oi. the rig -out I h i The uppe end o We er channel 55 f rmed with a slot 516 25) g rd plate 51,!) is formed with a p ur ty I em ee a ertures 8 in a i nment with slot 35:16- .A Ra M133? pander rods 158B hate uts 5 12 h e dedx their ends. Rods 580 are formed with bores 4 3mg, 26) in which a e slidebly ren wed pinfi 5&5, compreSSinnsprings 588 be n ,l tated n tliet si ss fins 586 arerprmed with ends i9!) :h yiri .a duced diameter substantially equa t th 4: 1ameter .of holes 518. Th fikn ll d r JOCL a he slid downwa dl intoslet 51. W fmtlw 312 158.6 retreated. These pins ere then inse ted in the pro er hole 5418 so give the Mammal spacing 0. the eig ende r ds- The expander re s a eemewh t vhunge han the run-taut flame and et t irrq msite nd ere v tapped-t0 rege v exnand er.iheaslsfifi fig 0 :Each expander heaLd, $110M} H tcludes Ga conica r nd 5. 4 ta ered t-eheynK-w mien 5.96, and 1a \streight ,gy ind tige {P $131011 459s, Arranged around the shan em tmnfi are :a plurality 9f qyl ndripe ,s emezitswpfi iea ,taineii in place zbyjmean's iof air ng B2 engaging withintanennul rq rpoveqfiflt :,f.Q .we d ds 10f segments Jinn er enlarg d and team iat m iauswqffizhardened.wi ewhi h eceived inia 5 m? 15118 Land mhichtextemls-mdlally 'hi Qlld e ytqtlie amnion :0f the Remainder need .A icompre sipn Dinnin 61 0 hdiRQd eroimd tthe streight sh r k moment and .hetw entnemndref th expande .lmgeed nation 1 :the tapered Yemeni; -5& Md

against ta afi guldfir ,iiormed be ind th gent e :emi i maim -tmllex fi 1 Land M (F s- .13 tim mmvidedetor .-.,sqpn ort e vtrite: ediat ;p9 i :01

tne-ezgnande i qodsifiqeliechgtr i nglwie teisl rg taltreneinlates 5 t6 secdunedrtoeethe hy iversehsplete. As seen Iain Eig- 27, th t -M E S? ext nt tthan plete .;al a mi mue (6. LL irn gvidedwvith vertieel flangegslidable in=-the greeves -Eaeh block is formed with an "aperture-through which extends an "expander ro'dfiflll, the blq ks thus serving-to support the rod whilerpemiittirgg limitedwerticalmovementathereef.

wQugi eriartuii "rods harem leiggth beppro metel h e ttherl aathtoft,thwmn qut f tejmrt-tieirpdstfiiallrarefixe t. .h I s,

apertures :ior rads m5. In? epmsit d m ionsiflmerempr visiedh w t hhea ;.an *t e mmsssliaeiinrepertures4. mine xing' let m fl ti l a. em w .tk uetiiei e .t q g t t t f h Jmesei rqdsi-likewiselha'yeaz 161951 1 ae ror ate tweete nei islsiiq'. it ee n r t e er term d rw tw i e e 'Y Mme-re I i i simpl thme m t it-spilgiie Q; as pull rp w meet? a bxovleedwithiteg 9d eedt e m l rheesl- T e we e-tin ieit i5! 9! 5 9 fi 3. ,is eiisiee 2 e islsiw e .erte iqei 9 (F ;9) thel w i j;- t xtesi t e g ske t reed .szerlrie thfle x ta 5 .9, sze $9 3 i g in?) ewed 4. time wit iia a L -t i. the pill ,per-rder lr ie a ds are Thefins 684are made of comparatively thin sheet metal J OIIDGd with tpocketstas i ls shown in i ts 2 e fzmieftip i's'iiz e 1 nd ey qpiger the entire surlarge heads mefi be iriserted 'i me i. i e m h. b zi iwlep edht w is whit ziiii i lz r ee his ep could be perfdrrned w and.

) orir'iiifg thesides are within 'the clamping device I! I.

Fig. 11. After the motor has started, cable 54'4fis .trolleyyBlZ and 6H iFigs. 5 6 the coil being constructed is comparatively short, r .its endgwill bespaced a we the end of the run-out frame and'it is necessary main frame before Figs.1 4, 111123) which rods 58d at intermediate points along their 'of .the puller heads, the tie V brackets 626,- the trolleys remaining A stationary;

short distance to the left of the'c la'mping device m shown iniFigJS. Two holding blocks 184 and 186, having semi-circular 'g ro'ov'es' 188 in'their mating surfaces, as is shown" in Fi'gs. 19 and 20, are then placed around the return bend, the return "bendfbeing thus; disposed" within the groove 788. The hairpin with the holding blocks 184 and I86 secured around the returnfbend' is then slid further to the right'until the blocks is then rotated in a counter-clockwise direction, asshownin Fig. 20, so that cam' l'l8presses the holding block" 186 against the, block 184 and presses this latter block against the fixed clamping plate I12; "The forward edge of blocks "[84 and 1.86 abut'again'st'the'inturnedabutments I'M and I19, whereby further movement of the hairpin in this direction is prevented. The ends of the hairpin are now projected some distance beyond the last'fin. v r

Operation of the tubeexmmders The next step is to'ex'pand' the tubes 688 within the holes B86 in the fiiflstfl l;v To accomplish this the rod'55 l",(Fi'gs."1, 2', 3) ismoved' in the proper direction so as to throw switch 550 (Fig. 3) in the motor circuitilflin the directio'h'to cause the motor to rotate in a direction such that shaft 500 will rotate in a clockwise direction, 'as' shown in straighten "out jthe toggle links 530 and 534, thus movihg th e clutch arm 526 in a diengage the dog clutch members The engagement .of the" clutch pulled so vas to ,causesthe shaft 590 to rotate in a clockwisedirec- ,tion, as'lviewedin Fig; 11, which inturn causes pinion 498,

, I which engages rack 496, to move'the pulle1j head (mute the left, as viewed in Figll.

. Inasmuch as the expander rods 58!] are'secured .to the puller head, they are caused to movejin the same direction. The expander rods 580, while in the run-out frame, are supported at intermediate points along their length by meansof the 'If'the length'of considerable distance from to provide means ior supporting-theexpander rods at one or more places along the length of the th' rea'ch the ends of, the coil; Such support is may be inserted in the comb trough." The centralpcrtion of 'theplate 824 is formed with'apertures forguiding'the expander rods 580. The vertical edges of the plate are comparatively thin'softhat they may be inserted in the grooves HlBofthe comb sections M0. sj ahdie BZ Bis provided for inserting and removing the supporting plate 824. None or one, or more of the supporting p1ates'824 may be employed, depending upon the distance between the end of the-run-out frame and the end of the'COll which is being manufactured. Several sets of plates 824 are provided, the plates of different sets being of different Widths andhaving apertures spaced on different centers, corresponding to the difference between tube centers of the various hairpins which it is desired to manufacture in the machine.

the trolleys 612 and lengths. During the'first part of this movement rods 624 slide inthe Lever [80 provided bya'plate 824 get-stat When the expander heads first enterthetubes of the hairpin, the rings 60'6" thereof ,(F contact the innerw'alls of the tubes and the tion causes the segments 668 of the e pa l derhe'ad to be slid from theconical portion. 596 back to the cylindrical portion 598, against the force of spring 6| ll. Inasmuch as the cylindrical-portion 1S. of less diameter than the conical portion, the expander heads pass through the tubes in this direction without expanding-the tubes *The'pullg er head'and expander rodsare moved to the left until the ends of the expander heads have passed beyond the last fin'adjacent to the return bend ,690. The motor 5 I is then' automatically stopped by the bracket 642 (Fig, '6) on the puller head channel 492 striking the arm fidll (Fig.1 1Q') ;;on

shaft extension 636' of switch 5 to opern the switch. The clutchbetween the motor and shaft 501) isthen disengaged by the operatorreleasing cable 544 and red stars then moved th t to" cause 'the motor to rotate in the reversefdirection "{Ih'e clutch is again engaged by pulling on the cable Land consequently-the shaft 500 is driveri'in a direction such as to move the puller head away ,from the main frame. It will be noted thatiior this direction of rotation; the torque is-transmitted through the straight-axial-faces of'jthe teeth formed on. clutch members 516 and 5|8.

Consequently; there is. no inherent tendency for,

the clutch to disengage. However, the force-of springs 54!] and564 tend t-o'disenga ge the clutch, but during the expanding operationthefclutch transmits solmuchtorque thatthe friction between t e teeth on clutch membersgi'alfi"andi5l8 isso great that the springs 538 and 564 are-notable todisengagethe clutch." f I a r i f As the puller head'withdraws theex-pa'nder rods from thejt'ubes, thejfrictijon between ring 1506 on the expanderheadsiand the'interior'of the tubes, causes the segments 690 to moveup; on the conical flportion 596; In this position 'the'jouter diameter interrupts-its circuit by means of offing 60b is greater thanithebriginal inner diameter or the tubes and as tnelex rfidr eads move out-of the tubes, the r ngs fiilfiexpand tlie walls of the tubes and forcethe .outer surfac efof each tube tightly against the material of-the fins SIM-surrounding the holes 686 therein;

'As soon as the expanderheads have been W mdrawn' from the ends ofthe tubes, the, forcegrequired to move the puller head. is greatly reduced and the torque transmitted-through theqclutch'zis reducedlto such anextent that-the"-'springsIMU and 564 are able to disengage" the clutch. 'C onsequentlyhmovementoi the puller head'i's' automatically stopped as soon as the expander'heads have been; withdrawn from 'the tubes', regardless of the particular tubes being p- Aft'erfthe, clutch has been d sengaged, the motor 5m runs idle'until the ,operator the switchf ro'd r the length erated upon.

554. :It will be noted that ,this switchgrodiand the. cable 544 for operating "the clutch extend'th'ge e t r len thft esg i t m W ee h assume elements may be controlled:from any position along the main frame. 1

As the puller head moves out, the trolleys s 2 and '6 may-remain stationarynear the end of th iolin- Out frame until thepullerflhead ha's j traveleda distance equal to the lengthof -tie rods 624: When-theheads 625 on-these tie rods therod's 6M areforced to travel with the puller head and consequentlypullthe trolley 612 along 630 are caused to move with the trolley filzthus I 'arecontactedbythe part 510 of the puller head,

pulling the trolley 6 along the run-outframe'.

It will benoted that, during both the in and out movement oftheexpander rods the greatest unsupported lengthbfthe expander rods in the run-out name is equal to approximately" onethird the length of the frame. This is sufficient to prevent buckling or undue sagging of :these rods, Tierods' 625 between trolley fil l and the modate finsihaving differently spaced apertures.

3: In awmachine'for fabricating finned heat exchangers of different lengths, a frame, means for retaining apertured fins: in spaced relationship and innaposition to receive a tube of desired length extending through the apertures; a carriagemovablymounted on said frame, a tube expander movable :bysaid carriage; means for moving said carriage in awdirection to advance said expander intoxsaid time means for movingisaid carriage in the oppositev direction to withdraw said expander from saidttube, and: means for aut matically stopping said carriage substantially immediately upon withdrawal of said expander from said tube, regardless, of the length of thelatter. 4; Inawmachine for fabricatingqfinned heat exchangersof different lengths a, frame, means for "retaining; aperturedifins in spaced relationship andin a position to receive a tube of desired length extending throughathe apertures, a carriage movably mountedonsaid-frame,a tube expanderwmovable by said carriage, an electric -;motor for driving said carriageya clutch in the "frame are provided to prevent the possibility of thetrolleys moving all the way "backwith the pullerhead, due tofriction on the tie rods 624 and 630.

After the expander rods have been withdrawn from the tubing, the handle 180 (Fig. of the clamping device IH is rotated so as to release the blocks I84 and 186. Thereupon, the finished hairpin, now consisting of the straight portions con-,

nected by means of the return bends and securely expanded against the fins 684, may be removed from the comb trough by rotating shaft I86 by means of handle 210 so that cams 2M raise bar 208.

- Bar 208 contacts the lower dges of the fins and also the lower edges of blocks I84 and 186 and hence raising of the bar lifts the hairpin upwardly. i i

It is to be understood that the foregoing description has been given for purposes of illustration only as showing preferred embodiments of the various structures in accordance with my invention, as is required by the patent statutes. 'It is not to be considered as limiting the scope of my inventiomwhich is to be determined by the appended claims.

What is claimed:

1. In a machine for fabricating finned tubing,

a frame, means carried by said frame and prodrivebetween said motor and said carriage, and meansitending, to disengage said clutch, .saidclutch including torque transmitting ,1 surfaces so arranged that the :transmission of torque; durin withdrawal of saidiexpander from said tube imposes a frictional resistance to disengagement,

whereby said clutch remains engaged while under load during-the withdrawal and is automatically disengaged by the last mentioned means when the load is relieved upon completion of the withdrawal, regardless of the length of said tube.

5. In a machine for fabricating finned heat'exchangers, a frame, means for retaining apertured fins in spaced relationship-and in a position to receive a tube extending through the apertures, a carriage movably mounted on said frame, an expander rod having one end secured to said carriage, a tube expander carried by the other end of said rod, said rod being arranged to be moved into said .tube by said carriage, a trolley movable on said frame for supporting said rod for maintaining said trolley in spaced relationviding grooves for retaining apertured fins in spaced relationship and with the apertures aligned so as to receive a tube extending therethrough, means for securing the tubing to said frame so as to restrain the tubing against lengthwise displacement, means for expanding the tubing in the apertures against the fins, a bar carried by said frame and disposed beneath the fins in said retaining means, a shaft rotatably mounted in said frame below said bar, and cam means on said shaft operable upon rotation of the latter to raise said bar into contact with the bottom edges of ship with said carriage and said tube as said rod is moved.

6. In a machine for fabricating finned heat exchangers, a frame, means for retaining apertured fins in spaced relationship and in a position to receive a tube extending through the apertures, a carriage movablymounted on said frame, an expander rod having one end secured to said carriage, a tube expander carried by the other end of said rod, said rod being arranged to be moved intosaid tube by said carriage, a trolley movable on said frame for supporting said rod between said carriage and said tube, and tie rods slidably connecting said trolley to said frame and to said carriage for maintaining said trolley in spaced relationship with said carriage and said tube as said rod is moved.

the fins to remove the latter and the tube as a unit from the retaining means.

2. In a machine for fabricating finned heat exchangers-a frame, means for retaining fins in spaced relationship, each fin being formed with spaced apertures adapted to receive tubes extending therethrough, a carriage movably mounte ed on said frame and having a plurality of sets of spaced holes, a plurality of rods, tube expanders carried by said rods, and means for securing a rod in any selected hole of each set, in order to vary the spacing between said rods to accom- 7. In a machine for fabricating finned heat exchangers, a frame, means for retaining apertured fins in spaced relationship and in a position to receive a tube extending through the apertures, a carriage movably mounted on said frame,

frame at a point adjacent to the end of'said tube and to said carriage for maintaining said trolley means in spaced relationship with said carriage to receive a tube extending through the apertures,

a carriage movably mounted on said frame, an expander rod having one end secured to said carriage, a tube expander carried by .the other end of said rod, said rod being arranged to be, moved into said tube by said carriage, a plurality of trolleys movable'on said frame for supporting said rod between said carriage and said tube, and tie rods for slidably connecting said trolleys together and for slidably connecting one trolley to said frame and another trolley to said carriage for maintaining said trolleys in spaced relationship with each other and with said carriage and said tube as said rod is moved. a v v 9. In a machine for fabricating finned heat exchangers, a frame, means for retaining fins in spaced relationship, each fin being formed with spaced apertures adapted to receive tubes extending therethrough, a carriage movably mounted on said frame, a pair of substantially parallel plates secured to said carriage, one of said-plates being formed with an elongated slot and the other plate being formed with a plurality of holes in alignment withsaid slot, a plurality of rods ex vtending through said slot, means to secure said rods to the plate with the elongated slot, theends of said rods being receivable in selectedones of said holes to vary the spacing between-said rods to accommodate fins having differently spaced apertures, and a tube expander carried by the opposite end of each rod. 1 Q ,5

10. In a machine for fabricating finned tubing, a frame, means carried'by said frame for-retainf ing'apertured fins in spaced relationship, each fin having at least two apertures whereby-a tubular hairpin may be inserted through said apertures, a pair of plates supportedon saidframe against longitudinal movement and having semi-circular mating recesses'in their adjacent faces, means for forcing said plates towards each other fonclamp;

ing the return bendof said hairpin to restrainlthe latter against longitudinal displacement; and means exerting a longitudinal pull on said hairpin for expanding the tubing thereof in the apertures against the fins. l 5.

LESTER U. 

